Hi. I am learning Arduino. I have read the analogWrite actually uses a digital signal, via the PWM technique. I also read that is good enough for dimming LED's, controlling motors, generating audio...a lot of things, after all. My question is, what are the main things you can't achieve with PWM, …

What can't you do with PWM compared to DAC

CrossRoads November 16, 2012, 4:29pm 4

low pass filter is external, just a resistor/capacitor.

there are lots of calculator websites, for example

PWM switches ~490 Hz, so pick values to filter out frequencies above that.

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